问引导切换边栏下拉图标

EN

<!-- USER -->
<li class="nav-header">
    <a href="#" data-toggle="collapse" data-target="#userMenu">
    <font color="#333333">User</font> <i class="icon-angle-down"></i>
    </a>
    <ul style="list-style: none;" class="collapse in" id="userMenu">
        <li class="active"><a href="#"><i class="icon-home"></i> Home</a></li>
        <li><a href="#"><i class="icon-envelope-alt"></i> Messages <span class="badge badge-info">4</span></a></li>
        <li><a href="#"><i class="icon-cogs"></i> Settings</a></li>
        <li><a href="#"><i class="icon-comment"></i> Shoutbox</a></li>
        <li><a href="#"><i class="icon-user"></i> Staff List</a></li>
        <li><a href="#"><i class="icon-flag"></i> My Infractions</a></li>
        <li><a href="#"><i class="icon-exclamation-sign"></i> Rules &amp; Regulations</a></li>
        <li><a href="#"><i class="icon-off"></i> Logout</a></li>
    </ul>
</li>
<!-- RADIO DJ -->
<li class="nav-header">
    <a href="#" data-toggle="collapse" data-target="#radioDJMenu">
    <font color="#34CCFF">Radio DJ</font> <i class="icon-angle-down"></i>
    </a>
    <ul style="list-style: none;" class="collapse" id="radioDJMenu">
        <li><a href="#">Information &amp; Stats</a></li>
        <li><a href="#">DJ Says</a></li>
        <li><a href="#">Request Line</a></li>
        <li><a href="#">Timetable</a></li>
        <li><a href="#">Banned Songs</a></li>
    </ul>
</li>